Main line: HashimotoUtaro
Variations: Dieter
White must play in order to live. Any other move fails.
and
only go to show that White makes eyes at the marked points.
and
should be held in reserve as ko threats.
fails.
After , she needs both a and b. Those points are miai for life. She can't take them both, so her group is dead.
at a fails likewise.
and
make a bent four in the corner shape, killing White. We assume that White can't escape at a.
This problem is an illustration of the proverb: "In a symmetrical position, play the symmetric point".
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